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API ReferenceAvail Node APIFetch block data using different calls

Fetch block data from Avail DA using RPC calls

The Avail node supports a variety of RPC calls for fetching block data. This page covers a few different calls that are commonly used to fetch block data:

Fetch block hash using block number

Parameters

parametertypeoptionaldescription
blockNumbernumbertrueThe block number of the block to fetch (fetches hash of latest block if not provided)

Example

  1. Inside your-file-name.ts, add the following code:
avail-js
import { SDK } from "avail-js-sdk"; export async function chainGetBlockHash() { // Initialize SDK with Turing endpoint const sdk = await SDK.New('wss://turing-rpc.avail.so/ws'); // 1. Gets the block hash for the latest block if no argument is provided // 2. Gets the block hash for the block at the given block number if a block number is provided const hash = await sdk.client.api.rpc.chain.getBlockHash(1451847) console.log("getBlockHash") console.log(hash.toJSON()) process.exit(0); } // Execute the function chainGetBlockHash()
  1. Run the script using the following command:
terminal
node your-file-name.ts

Fetch block header using block hash

Parameters

parametertypeoptionaldescription
blockHashstringtrueThe hash of the block to fetch (fetches header of latest block if not provided)

Example

  1. Inside your-file-name.ts, add the following code:
avail-js
import { SDK } from "avail-js-sdk"; export async function chainGetBlockHeader() { // Initialize SDK with Turing endpoint const sdk = await SDK.New('wss://turing-rpc.avail.so/ws'); // 1. Gets the block header for the latest block if no argument is provided // 2. Gets the block header for a specific block if a block hash is provided const header = await sdk.client.api.rpc.chain.getHeader("0x75a6c54bb5ea904e47fa151956992d7cf543bc7c936d78488e311db8e10397c1") console.log("getBlockHeader") console.log(header.toJSON()) process.exit(0); } // Execute the function chainGetBlockHeader()
  1. Run the script using the following command:
terminal
node your-file-name.ts

Fetch entire block using block hash

Parameters

parametertypeoptionaldescription
blockHashstringtrueThe hash of the block to fetch (fetches block of latest block if not provided)

Example

  1. Inside your-file-name.ts, add the following code:
avail-js
import { SDK } from "avail-js-sdk"; export async function chainGetBlock() { // Initialize SDK with Turing endpoint const sdk = await SDK.New('wss://turing-rpc.avail.so/ws'); // 1. Gets the block for the latest block if no argument is provided // 2. Gets block header and body for a specific block if a block hash is provided const block = await sdk.client.api.rpc.chain.getBlock("0x75a6c54bb5ea904e47fa151956992d7cf543bc7c936d78488e311db8e10397c1") console.log("getBlock") console.log(block.toJSON()) process.exit(0); } // Execute the function chainGetBlock()
  1. Run the script using the following command:
terminal
node your-file-name.ts
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